title: Activity rhythm of Drosophila kept in complete darkness for 1300 generations.
abstract: Locomotor activity rhythms of dark stock flies of Drosophila melanogaster kept in complete darkness for 700 to 1340 generations were examined. The stock was established by the late Prof. S. Mori in November 1954 to investigate long-term effects of darkness on organisms. The activity of flies was recorded under three types of light conditions: DD after LD12:12, and DD after exposure to a 3.5 h (P3) or 7.5 h (P7) light pulse. In all of these conditions, the experimental dark flies exhibited clear circadian rhythms similar to those of control light flies. We compare our results with those of various studies on troglobites.
authors.affiliation: Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan. imafuku@kyoto.zaq.ne.jp
authors.forename: Michio
authors.initials: M
authors.lastname: Imafuku
authors.forename: Takashi
authors.initials: T
authors.lastname: Haramura
mesh_terms: D000818:Animals; D003624:Darkness; D004331:Drosophila melanogaster / Q000502:physiology*; D004777:Environment; D009043:Motor Activity / Q000502:physiology*; D010507:Periodicity